Local Synthesis and Function of Neuro-Estrogen and Neuro-Androgen: Impact on Hippocampus-Related Cognition and Neuronal Plasticity

January 2026 in “ Frontiers in Cellular Neuroscience ”

S. Kawato, Yasushi Hojo, Mika Soma, S. Horie, Minoru Saito, Mari Ogiue-Ikeda

TLDR Neurosteroids like neuro-estrogen and neuro-androgen are crucial for brain function and can improve cognition and protect against aging-related decline.

The document discusses the local synthesis and function of neuro-estrogen (nE2) and neuro-androgen (nT and nDHT) in the brain, particularly their impact on hippocampus-related cognition and neuronal plasticity. These neurosteroids, synthesized independently of circulating sex steroids, play crucial roles in modulating synaptic plasticity, cognitive performance, and protecting against age-related neurological decline. The study highlights that nE2 and nDHT have distinct effects on long-term potentiation (LTP) and dendritic spine formation, with nE2 stimulating LTP and nDHT inhibiting it. Additionally, the document notes sex differences in neurosteroid concentrations, with higher nE2 levels in males, and discusses the complex signaling pathways involved in cognitive behavior. It also addresses aging-related cognitive decline linked to decreased neurosteroid levels and suggests that hormone replacement therapies can improve cognitive function in both males and females.

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